①We have been learning English for three years.(改为同义句)

问题描述:

①We have been learning English for three years.(改为同义句)
We have been learning English___ ____ ____ ____.
②I started playing tennis when was seven years old.(改为同义句)
I started playing tennis ____ ____ ____ ____ seven.

1 since three years ago
2 at the age of